Flashes from unseen lightning are called ______________
Fill in the blank(s) with correct word
heat lightning
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Mercury's crust
A. is much thicker than Earth's or Venus's. B. is molten because it is so close to the Sun. C. has an unusually high concentration of silicate rocks. D. may have been mostly lost after a collision with a large planetesimal.
What is one difference between a rad and a rem?
a. A rad measures an amount of radiation and a rem measures a biological effect. b. A rad measures a biological effect and a rem measures an amount of radiation. c. Rem is an older term for rad. d. One rem equals 100 rads. e. One rad equals 100 rems.
A proton (mass = 1.67 × 10^-27 kg) has a kinetic energy of 1.00 MeV. If its momentum is measured with an uncertainty of 2.00%, what is the minimum uncertainty in its position? (h = 6.63 × 10^-34 J×s and 1 eV = 1.6 × 10^-19 J)
a. 9.08 × 10^-14 m c. 5.64 × 10^-14 m b. 1.14 × 10^-13 m d. 2.28 × 10^-13 m
A V-shaped bow wave is produced when a boat moves
1) more slowly than the velocity of waves in the water. 2) as fast as the waves in the water. 3) faster than the velocity of waves in the water. 4) at any speed, slower or faster than the water waves. Which bow wave corresponds to the faster-moving boat? 5) I 6) II